1. The problem statement, all variables and given/known data given:-fuel and air mass flow, measured mole ratios of exhaust composition y_i. Lets assume stoichiometric combustion so we have only CO2, H20 and N2 as products. 2. Relevant equations Can EGR ratio be calculated from available data? 3. The attempt at a solution I get result that molar ratios don't depend on EGR ratio.